Ametek Reichert 13778 Quick Start Manual page 3

Connecting ClearChart 4, 4X, 4P and AcuityChek:
The serial port (A) on the rear of the device is where the Wireless Dongle
(B) will connect. The Extension Cable is used to run the Wireless
Dongle to a location hidden from view, such as the back of the instrument
or the wall. A Hook and Loop Fastener is provided to hide the dongle
from view, by adhering the Wireless Dongle to the desired location either
on the wall or on the back of the unit.
Connect the Dongle (A) to the Serial Cable.
Dongle and Serial Cable Connected
A
Connect the Serial Cable to the Serial Port (B) on the bottom of the unit.
ClearChart 4 Serial Port
B
ClearChart 4 w/ Cable Installed
Serial Cable to Dongle